#gray {
	width: 400px;
	height: 200px;
	position: absolute;
	left: 50%;
	top: 50%;
	margin: -100px 0 0 -200px;
	background-color: #ccc;
}
#circle1,#circle2 {
	width: 50px;
	height: 50px;
	background-color: #fc0;
}
#circle1 {
	border-radius: 0 0 50px 0;
}
#circle2 {	
	border-radius: 50px 0 0 0;
	position: absolute;
	right: 0px;
	bottom: 0px;
}
